#
# Copyright 2004, 2005, 2010 Zuza Software Foundation
#
# This file is part of translate.
#
# translate is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# translate is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.

"""
Progress bar utilities for reporting feedback on the progress of an
application.
"""

import sys
import time


class DotsProgressBar:
    """
    An ultra-simple progress indicator that just writes a dot for each
    action.
    """

    def __init__(self):
        self.stderr = sys.stderr
        self.amount = 0

    def show(self, verbosemessage):
        """Show a dot for progress :-)."""
        # pylint: disable=W0613
        self.stderr.write(".")
        self.stderr.flush()

    def close(self):
        self.stderr.write("\n")
        self.stderr.flush()

    def __del__(self):
        self.close()


class NoProgressBar:
    """An invisible indicator that does nothing."""

    def __init__(self):
        self.amount = 0

    def show(self, verbosemessage):
        """Show nothing for progress :-)."""

    def close(self):
        pass


class ProgressBar:
    """A plain progress bar that doesn't know very much about output."""

    def __init__(self, minValue=0, maxValue=100, totalWidth=50):
        self.progBar = "[]"  # This holds the progress bar string
        self.min = minValue
        self.max = maxValue
        self.span = maxValue - minValue
        self.width = totalWidth
        self.amount = 0  # When amount == max, we are 100% done

    def __str__(self):
        """Produces the string representing the progress bar."""
        self.amount = max(self.amount, self.min)
        self.amount = min(self.amount, self.max)

        # Figure out the new percent done, round to an integer
        diffFromMin = float(self.amount - self.min)
        percentDone = (diffFromMin / float(self.span)) * 100.0
        percentDone = round(percentDone)
        percentDone = int(percentDone)

        # Figure out how many hash bars the percentage should be
        allFull = self.width - 7
        numHashes = (percentDone / 100.0) * allFull
        numHashes = round(numHashes)

        # build a progress bar with hashes and spaces
        self.progBar = "[{}{}] {:3d}%".format(
            "#" * numHashes,
            " " * (allFull - numHashes),
            percentDone,
        )
        return str(self.progBar)

    def show(self, verbosemessage):
        """Displays the progress bar."""
        # pylint: disable=W0613
        print(self)


class MessageProgressBar(ProgressBar):
    """
    A ProgressBar that just writes out the messages without any progress
    display.
    """

    def __init__(self, *args, **kwargs):
        self.sys = sys
        super().__init__(*args, **kwargs)

    def show(self, verbosemessage):
        self.sys.stderr.write(f"{verbosemessage}\n")
        self.sys.stderr.flush()


class HashProgressBar(ProgressBar):
    """A ProgressBar which knows how to go back to the beginning of the line."""

    def __init__(self, *args, **kwargs):
        self.sys = sys
        super().__init__(*args, **kwargs)

    def show(self, verbosemessage):
        self.sys.stderr.write(f"{self}\r")
        self.sys.stderr.flush()

    def close(self):
        self.sys.stderr.write("\n")
        self.sys.stderr.flush()

    def __del__(self):
        self.close()


class VerboseProgressBar(HashProgressBar):
    def __init__(self, *args, **kwargs):
        self.lastwidth = 0
        super().__init__(*args, **kwargs)

    def show(self, verbosemessage):
        output = str(self)
        self.sys.stderr.write("\r" + " " * self.lastwidth)
        self.sys.stderr.write(f"\r{verbosemessage}\n")
        self.lastwidth = len(output)
        self.sys.stderr.write(f"\r{output}")
        self.sys.stderr.flush()


def test(progressbar):
    for n in range(progressbar.min, progressbar.max + 1, 5):
        progressbar.amount = n
        progressbar.show("Some message")
        time.sleep(0.2)


if __name__ == "__main__":
    p = HashProgressBar(0, 100, 50)
    test(p)
